Why did Cialis become the best-selling treatment for erectile dysfunction?

Cialis is the best-selling prescription drug for erectile dysfunction and is still considered a “blockbuster” drug.

Even though Cialis will lose patent protection in the United States and Europe later in 2017, it is still a blockbuster drug (defined as a drug that brings in at least $1 billion per year in revenues). It’s more popular than Viagra and Levitra primarily because it has a significantly longer half-life than Viagra and Levitra. In other words, for most men, it’s effective far longer than the alternatives.

That’s been a big selling point for Cialis, with ads nicknaming it the “Weekend Pill” because many men can take it on a Friday night and still experience its effects on Sunday. The half-life of Cialis is around 18 hours, compared to 4 to 6 hours for Viagra and Levitra. This allows a higher degree of spontaneity, and a lot of men prefer that to scheduling taking a pill 30 minutes to an hour before sex.